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Meet the Combo Breaker: a motorized, battery powered, 3D printed, Arduino-based device that can crack any Master combination lock in a very short period of time. The solution is portable and open source. Samy Kamkar, the developer, has shared all the code and 3D models for this project, so you can try to build your own.
The Combo Breaker was created using an Arduino Nano micro-controller, a stepper motor, a 500 mAh battery, and a few other parts. You can find more information here.